[kdenlive] property animation example

[Vincent Pinon]

Hello,

In mlt source, "git grep -l _anim_get_ src/modules/" gives the following animation enabled filters:
src/modules/core/filter_brightness.c
src/modules/core/filter_gamma.c
src/modules/core/filter_panner.c
src/modules/core/producer_tone.c
src/modules/kdenlive/filter_boxblur.c
src/modules/kdenlive/filter_wave.c
src/modules/normalize/filter_volume.c
src/modules/oldfilm/filter_dust.c
src/modules/oldfilm/filter_grain.c
src/modules/oldfilm/filter_lines.c
src/modules/oldfilm/filter_oldfilm.c
src/modules/oldfilm/filter_tcolor.c
src/modules/opengl/filter_movit_blur.cpp
src/modules/opengl/filter_movit_deconvolution_sharpen.cpp
src/modules/opengl/filter_movit_diffusion.cpp
src/modules/opengl/filter_movit_glow.cpp
src/modules/opengl/filter_movit_lift_gamma_gain.cpp
src/modules/opengl/filter_movit_opacity.cpp
src/modules/opengl/filter_movit_resize.cpp
src/modules/opengl/filter_movit_saturation.cpp
src/modules/opengl/filter_movit_vignette.cpp
src/modules/opengl/filter_movit_white_balance.cpp
src/modules/opengl/transition_movit_luma.cpp
src/modules/opengl/transition_movit_mix.cpp
src/modules/plus/filter_charcoal.c
src/modules/plus/filter_lift_gamma_gain.c
src/modules/plus/filter_lumakey.c
src/modules/plus/filter_sepia.c
src/modules/plusgpl/filter_burn.c
src/modules/plusgpl/filter_lumaliftgaingamma.c
src/modules/qt/filter_audiowaveform.cpp
src/modules/qt/filter_lightshow.cpp

you can read each associated YML description to know what they are about.
(would be good to work on others, especially the ones with geometry!)

A simplistic example attached, applying brightness effect (the keyframable one, not the frei0r one)
and editing XML to change "start" parameter into "level" parameter with an animation string.

Vincent
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